Slax is a LiveCD Linux distribution based on Slackware and is being developed by Tomáš Matějíček. Packages can be selected in a website where users can build a custom Slax ISO image. The tagline for Slax refers to itself as "your pocket operating system".

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One of the main benefits of the Slax distribution is its ease of customization. Additional software can be added and removed, using Slackware packages and Slax modules. A traditional package manager such as Debian's APT is not required to load additional software; Slax modules are completely self-contained. Users can also modify the default CD image or USB drive installation to customize the packages available in the distribution on boot. Slax also allows Slackware packages to be converted to Slax modules with the tgz2lzm command.

The Slax homepage offers a software repository for downloading user created modules and uploading new ones.[2]

Slax modules are compressed read-only SquashFSfile system images that are compressed with a LZMA compressor. The various modules are stacked together to build the complete Slax root directory. A supplemental writable layer (a tmpfs file system) is put on the top of the stack to implement the write functionality.

The stackable file system of choice changed between Slax versions 5 (UnionFS) and 6 (aufs), as did the module file name extension (changed from .mo to .lzm).

Slax 6 is offered in a single version, and completely relies on modules (additional packages) for extra features. From version 6, modules are based on LZMA compression, but some compatibility was initially provided between the obsolete .mo modules used by Slax version 5 and the more recent .lzm modules of version 6. As there have been some changes between Linux kernel versions during sub-version releases of Slax 6, however, the .mo modules of Slax 5 are now considered obsolete. Each module or package should be compiled for compatibility with the Linux kernel currently in use.

Slax version 7 was announced on the developer's blog (which has now been integrated into a newly refreshed Slax website). Slax 7 supports both 64-bit and 32-bit architectures, and according to its download page, "is available in more than 50 languages". It also features a stripped down version of KDE 4, a new wallpaper, and a new module system.